Python上的Php导入麻烦

I'm calling a py script from php and everything seems ok untill I import cv2, then the troubles start.

Situation:

1# I have a folder test/ with test.php and test_script.py.

test.php:

<?php

$command = escapeshellcmd( 'python test_script.py' );
$output = shell_exec($command);

echo $output;

test_script.py:

import os
import json
import numpy as np
import cv2
print('pol')

2# If I run it I visualize nothing in test/test.php; instead if I comment "import cv2" it runs perfectly visualizing "pol" as output. 3# The path variable called by php is the same called by cmd (yes, windows..)

4# in cmd I can easily call:

> python test_script.py

and it works fine

Specs
Php:7.2.2
Python: 3.6.5 on Anaconda3

So, how can I make it work the same on php?? Why is not working even if in cmd it works?

Thank you in advance

Update #1
my sdout returns:
Traceback (most recent call last):
File "predict_test.py", line 10, in
import cv2
ImportError: DLL load failed: Access is denied.

but I already set Full control permissions by Users and System, on Anaconda3 folder.